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katrin2010 [14]

2 years ago

14

Substance A is mixed with water and donates 0.4% of its H+ ions. Which of the following BEST describes Substance A? (See picture

provided.)

1 answer:

mariarad [96]2 years ago

7 0

Answer:

Explanation:

honesty i just know it has to be b or d because bases don’t donate. acids donate.

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Two hydrogen atoms collide in a head on collision and end up with zero kinetic energy. Each then emits a photon of 121.6 nm (n=2

Zinaida [17]

Explanation:

Expression for the kinetic energy is as follows.

K.E = $\frac{1}{2}mv^{2}$

Now, total kinetic energy will be as follows.

K.E = $2 \times \frac{1}{2}mv^{2}$ = $m \times v^{2}$

Since, this energy converts into electromagnetic radiation of wavelength 121.6 nm.

Relation between energy and photon is as follows.

Energy of photon = $\frac{hc}{\lambda}$

= $\frac{6.626 \times 10^{-34} \times 3 \times 10^{8}}{121.6 \times 10^{-9}}$

= $1.63 \times 10^{-18} J$

$m \times v^{2} = 1.63 \times 10^{-18}$

v = $\sqrt{\frac{1.63 \times 10^{-18}}{1.67 \times 10^{-27}}$

= $3.12 \times 10^{4}$ m/s

Thus, we can conclude that atoms were moving at a speed of $3.12 \times 10^{4}$ m/s before the collision.

8 0

3 years ago

Question 9 of 10

aksik [14]

Answer:

The answer is B an open system allows energy and mass to move in and out of it

Hope it helps

7 0

2 years ago

Heroin was originally going to be called "wunderlich", a German word for wonderful, since one chemist thought the substance made

Zarrin [17]

Answer:

heroic

Explanation:

Bayer, a German pharmaceutical company, named the substance it synthesized "heroin", probably from the word heroisch, German for heroic, because in field studies people using the medicine felt "heroic".

BTW, I found this information on this wedsite: https://www.answers.com/Q/Where_did_heroin_get_its_name

Also, if you want some more history about this drug, you can visit this article: https://www.narconon.org/drug-information/heroin-history.html

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3 years ago

i need help with these. its balancing. the blank spaces are where u put the numbers. and the stuff on the sidd is how u show wor

zlopas [31]

7. 1,2,2,2
8. 4,3,1
9. 1,4,1,2
10. 3,4,1,4

7 0

2 years ago

Which of the following statements does not describe a chemical property of oxygen:

g100num [7]

I have a feeling that #2 is the one.

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3 years ago